$48 + 48 ÷ 6 × 4 =$
$35 + 15 - 35 + 15 =$
$18 + 2 × 18 + 2 =$
$15 × 4 ÷ 15 × 4 =$
$180 - 180 ÷ 30 × 5 =$
$80 - (16 + 32) ÷ 2 =$
$630 ÷ 7 - 40 × 2 =$
$110 + 35 × 2 - 60 =$
$270 ÷ 30 + 120 × 4 =$
$80 - 40 + 10 × 30 =$
$150 × 4 - 630 ÷ 90 =$
$(200 - 40) ÷ (30 + 50) =$
$10 + 540 ÷ 6 - 15 =$
$20 × 6 - 360 ÷ 90 =$
$70 × 3 - 480 ÷ 60 =$
$(300 + 540) ÷ 7 × 10 =$
$450 ÷ 50 ÷ 9 + 99 =$
$315 + 20 × 4 ÷ 80 =$
$50 - 26 × 20 ÷ 40 =$

1.
$48 + 48 ÷ 6 × 4$
$=48+8× 4$
$=48 + 32$
$= 80$
2.
$35 + 15 - 35 + 15$
$=(35-35)+(15 + 15)$
$=0 + 30$
$= 30$
3.
$18 + 2 × 18 + 2$
$=18+2×(18 + 1)$
$=18+2×19$
$=18 + 38$
$= 56$
（或$18 + 2 × 18 + 2=18+36 + 2=56$）
4.
$15 × 4 ÷ 15 × 4$
$=(15÷15)×(4 × 4)$
$=1×16$
$= 16$
5.
$180 - 180 ÷ 30 × 5$
$=180-6× 5$
$=180 - 30$
$= 150$
6.
$80 - (16 + 32) ÷ 2$
$=80-48÷ 2$
$=80 - 24$
$= 56$
7.
$630 ÷ 7 - 40 × 2$
$=90-80$
$= 10$
8.
$110 + 35 × 2 - 60$
$=110 + 70-60$
$=180-60$
$= 120$
9.
$270 ÷ 30 + 120 × 4$
$=9+480$
$= 489$
10.
$80 - 40 + 10 × 30$
$=80 - 40+300$
$=40+300$
$= 340$
11.
$150 × 4 - 630 ÷ 90$
$=600 - 7$
$= 593$
12.
$(200 - 40) ÷ (30 + 50)$
$=160÷80$
$= 2$
13.
$10 + 540 ÷ 6 - 15$
$=10 + 90-15$
$=100 - 15$
$= 85$
14.
$20 × 6 - 360 ÷ 90$
$=120 - 4$
$= 116$
15.
$70 × 3 - 480 ÷ 60$
$=210 - 8$
$= 202$
16.
$(300 + 540) ÷ 7 × 10$
$=840÷7×10$
$=120×10$
$= 1200$
17.
$450 ÷ 50 ÷ 9 + 99$
$=9÷9+99$
$=1+99$
$= 100$
18.
$315 + 20 × 4 ÷ 80$
$=315+80÷80$
$=315 + 1$
$= 316$
19.
$50 - 26 × 20 ÷ 40$
$=50-520÷40$
$=50 - 13$
$= 37$

把下面每组算式列成综合算式
(1) $150 - 85 = 65$
$4 × 65 = 260$

(2) $92 - 48 = 44$
$100 - 44 = 56$

(3) $28 × 5 = 140$
$270 ÷ 18 = 15$
$140 + 15 = 155$

(4) $18 + 57 = 75$
$60 - 46 = 14$
$75 × 14 = 1050$

(5) $30 × 8 = 240$
$240 ÷ 12 = 20$
$72 + 20 = 92$

(1) $4×(150 - 85) = 260$
(2) $100 - (92 - 48) = 56$
(3) $28×5 + 270÷18 = 155$
(4) $(18 + 57)×(60 - 46) = 1050$
(5) $72 + 30×8÷12 = 92$