四则混合运算(2)1: ⑴ 53459 1710688 1625388 ⑵ 1.708 0.488 0.3892:285714 100428571 1100571428 11100714285 111100857142 11111003:⑴(163-160)÷160 =3÷160 =1.875% ⑵ (45-40)÷45 =5÷45 ≈11.1% ⑶ 小明的体重比小华的体重重百分之几? (45-39)÷39×100%≈15.4%4:⑴(98-80)÷80 =18÷80 =22.5% ⑵ 80x(1+22.5%) =80x1.225 =98(只) ⑶ 98÷(1+22.5%) |